Dial for clocks



' Oct. 28, 1924. 1,513,317

. W. FRAKE$ DIAL FOR CLOCKS Filed June 24, 1922 Inventor PatentcdOct, 28, 1 924. I 1,513,317

' UNITED sures PATENT OFFICE.

mm mum, F GRAND FORKS, BRITISH QOLUMIBIA, CANA D A. I

DIAL FOR CLOCKS.

Application filed June 24, 1922. Serial in. 570,753.

To all whom it may concern: the dials themselves will be of some suit-able Be it known that I, WILLIAM FRAKES, a metal also.

subject of Great Britain and Ireland, resid- C1rcle C enumerates the hours of Greening at Grand Forks, in the Province of wich mean time both a. m. and p. m.

5 British Columbia, in the Dominion of Can- Circles D and E combine longitude and ada, have invented a new and useful Dial time. In circle D longitude is enumerated for Qloc of which the following is a every 15 equallin one hour of time, and specification. each 15 is again su divided into three parts My invention relates to an improved 24 of 5, each equal to twenty minutes of time.

10 hour dial for theclock, or time piece, where- Circle E again subdivides each 5 into one by the correct local mean time may be kept degree sections equallin 4 minutes of time. by the clock, on the meridian it is situated Circle F gives geograp 'calnames of well u 11. Also it indicates the corrtzplonding known cities and countries of the world, (x r enwicm mean time, or W ington and. these are placed opposite their respec- 1 mean time as circumstances may require. tlve longitudes.

The dial will also denote those points on Special note may here be made in referthe earths surface where it is noon or midence to circles D and E. Time read from ni ht. 7 these circles would be the same in any. part Tt will, be seen later in this'specification, of the world, as the sun and the positive 20 suchadial will obviate the necessity for time point of the hour han are moving in zones'on the North American or other conunison on this circle. Therefore an obtinents and establish a natural standard server, at aglance can read oil the cortime. as kept by the sun throughout the responding local time at his meridian: This world. Moreover the clock divides the suns is one by observing the time indicated on 25 diurnal arc into two equal thusgivdial A by the positive point of the hour ing the same amount of day ight, both a. in. hand, the movable part of the dial'having and p. m. (error in equation of time exfirst been adjustedrso that the 12 oclock, ce ted); v noon indication on dial D is opposite the ihe dial is constructed in two arts, first, longitude of-the place whose local time is the central part,A, B, for'loc time also required. The difliculties caused on rail- 35 a. m. and p. -m., and the two hands. The ways by the time zones could be removed or circle A enumerates the hours from noon to greatly reduced by running all trains acmidnight on the right hand semicircle, and cording to the civil time (that is Greenfrom mi ht to noon on the left hand wich tun or the time at any'other agreed 35 semicircle the circle 'B, the minutes of. place) an using clocks provided with-dials time are recorded as on the ordinary dial, according to m invention for reducing the minute hand crossing the semidiameter civil time to t e local time, at ,ev staof the dial in the usual manner. The hour tion. Time tables for local use co d be hand difiers from the ordinary hour compiled by using a. clock dial'accordin to Q hand, b stretching clear across the two my invention for reduc' I the times ven 5 parts the dial, as shown in the drawon tl 1e general time tables which woul xgive mg. The 'tive point of, this hand, fcivil time) to the corresponding, local marked N oon-at moves in unison and hartimes. Railway time tables, &c;','} eould be mony with the thus indicating the com iled from these circles, and transferred meridian with which 'itis' in transit. The to equivalent .local time, so that time 7 opposite, or negative point of hand zones would not be nece j marked Mi t at i indicates The clock be set in its place, and the the longitude w ere it is midnig "t. longitude obtaifi, ad'ust the clock to this 'The second or outer part ofthe dial comlongitude by slidin%t e outer part of the prising the circles C D E F is movable and dia (circles 0 D F) so that the corcan be slid around to meet the required ad-v r ndin longitude on this circle cuts justment for lon 'tude. In the drawing at "an er the airline G at the noon of the local circle F two sma lugs are attached for this dial, and clamp the ad'ustable art of the purpose. On the real dial these may be dial permanent The airline is secured superseded by small metal attachments, and at one end to e edge of the dial. A B at no and at its other end to the clock casing Z as indicated in the drawing. The clock casing also supports one or more fixed brackets Y carrying set-screws M adapted to engage against the surface of the movable part of the dial,-to hold it in adjusted position. Clamps are not shown in the drawing. For example, say the clock is set up in Washington, D. C. The lon itude being 77 west of Greenwich. Bring 7 of west longitude under the hair line as above, and suppose it noon at VVashington, D. 0., local mean time, you will note the Greenwich mean time to be 5hr. 8111. p. 1n. andthe time at Singapore'to be I midnight.

Again say your local time reads 3hrs. 36m. 1). 1n. Corresponding Greenwich mean time reads 8h. 44m. p. m. and on a meridian about Port Simpson, B. C., it is noon and on a meridian passing throu' 11 the Island of Madagascar it is midnight. It will be noted in circles D and E the Greenwich mean time can be read to 42 minute intervals only, but the minutes of Greenwich mean time may also be read from the minute hand of the clock. Example, say minute hand reads 22 minutes, add to this the number of minutes of the adjustment. Say adjustment 5h. 8m. Greenwich mean time add 8m. to 22m.:80m. Greenwich time.

In east longitude the difference of minutes is subtractive.

'I claim a clock dial'as set forth in the above specifications and drawings as my invention and what I desire to secure by Letters Patent is 1. A geographical clock comprising a fixed inner twenty-four hour dial and an outer dial concentric therewith-and adjustable thereabout at will, said outer dial being divided into twenty-tour hourdivisions and three hundred and sixty degrees of Iongitude. V

2. A geographical clock according to claim 1 including namesof places in and parts of the world marked on said outer dial opposite the corresponding degrees of longitude.

3. A geographical clock comprising a fixed inner twenty-four hour dial, an outer dial adjustable thereabout at will, degrees of longitude marked on said outer dial, names of places in and parts of the world marked on said outer dial opposite the corresponding dcgrees of longitude and an hour hand stretching clear across said dial and having diametrically opposite positive and negative points. j

'4. A geographical clock according to claim 1 including an hour hand stretching clear across saiddial and having diametrically opposite positive and negative points.

A geographical clock clear across saiddial and havingdiametrically opposite positive and negativepoints, names and places in and parts of the wo-rldbeing marked on said outer dial opposite the corresponding degrees of longitude. V

G. A' geographical clock according to claim 1 including lugs 'on said outer dial for adjusting same.

7. A fixed inner twenty-four hour dial, an outer dial concentric therewith and adjustable thereabout at will, twenty-four hour divisions and three hundred and sixty degrees" of longitude. marked on said outer dial,

g according to claim 1 including an hour hand stretching geographical clock comprising a. 

